Alert archive / Minnesota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 107, NWS Twin Cities, MN

July 18, 1986Chippewa County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 18, 1986, 6:40 PM CDT for Chippewa County, Minnesota. It was in force for 65 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 18, 1986, 6:40 PM CDT (23:40 UTC)
Expired: Jul 18, 1986, 7:45 PM CDT
In force: 65 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

County Chippewa County, MN

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

Time	Report	Where	Remark
Jul 18, 6:58 PM CDT	Hail 2	Chippewa, MN

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 11.7 hours before the alert went out and 156 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2817 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 862 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 36 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 18, 1:12 PM CDT, 5 hours 28 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
110 PM CDT FRI JUL 18 1986

...HOT AND HUMID WEATHER CONTINUES OVER SOUTHERN MINNESOTA TODAY...

TEMPERTURES IN SOUTHERN MINNESOTA WILL BE IN THE UPPER 80S TO LOWER 90S
THIS AFTERNOON PUSHING THE APPARENT TEMPERATURE...OR HEAT INDEX...TO
BETWEEN 95 AND 105 DEGREES..WITH ISOLATED READINGS SLIGHTLY ABOVE
THE 105 DEGREE MARK. THE APPARENT TEMPERATURE...OR HEAT INDEX...IS A
MEASURE OF THE CONTRIBUTION HUMIDITY MAKES WITH HIGH TEMPERATURES TO
REDUCE THE HUMAN BODYS ABILITY TO COOL ITSELF.

THERE COULD BE..SLIGHT..RELIEF ON SATURDAY...BUT IN GENERAL THE WARM
AND HUMID AIR IS EXPECTED BE AROUND UNTIL SUNDAY...WHEN COOLER AIR IS
EXPECTED TO PUSH IN FROM THE NORTHWEST.

THOSE PEOPLE WHO ARE WORKING OUT OF DOORS...THOSE LIVING IN
UNAIRCONDITIONED SPACES...THE ELDERLY...AND PEOPLE IN POOR HEALTH
SHOULD TAKE PRECAUTIONS AS PROLONGED EXPOSURE TO THESE CONDITIONS
CAN LEAD _TO HEAT EXHAUSTION OR POSSIBLE HEAT STROKE.
WILLIS

Special weather statement, Jul 18, 5:30 PM CDT, 1 hour 10 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST CLOUD MN
530 PM CDT FRI JUL 18 1986.

...SEVERE THUNDERSTORM WATCH FOR EAST CENTRAL MINNESOTA UNTIL 10 PM
CDT...

...SEVERE THUNDERSTORM WARNING FOR SHERBURNE UNTIL 6 PM CDT

AT 5 30 PM CDT RADAR SHOWED THE STRONGEST STORM IN EXTREME SOUTHERN
MILLE LACS COUNTY AND EASTERN SHERBURNE COUTNY MOVING EAST AT 25 MPH.
1/2 INCH HAIL AND WINDS OF 50 TO 55 MPH HAVE BEEN REPORTED FROM THESE
STORMS rBY THE PRINCETON RADIO STATION AT 520 PM CDT

RUBIN/NISTLER

Special weather statement, Jul 18, 5:50 PM CDT, 50 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST CLOUD MN
550 PM CDT FRI JUL 18 1986.

...SEVERE THUNDERSTORM WATCH FOR EAST CENTRAL MINNESOTA UNTIL 10 PM
CDT...

...SEVERE THUNDERSTORM WARNING FOR SHERBURNE UNTIL 6 PM CDT HAS BEEN
CANCELED...

AT 5 50 PM CDT RADAR SHOWED THE STRONG THUNDERSTORMS HAVE MOVED EAST
OF SHERBURNE COUNTY. 1/2 INCH HAIL AND WINDS OF 50 TO 55 MPH HAD
BEEN REPORTED FROM THESE STORMS BY THE PRINCETON RADIO STATION AT 520
PM CDT

RUBIN/NISTLER

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 18, 4:54 PM CDT	Tornado Warning	MPX	Anoka, Hennepin, Ramsey	36 min
Jul 18, 5:00 PM CDT	Severe Thunderstorm Warning	MPX	Sherburne	60 min
Jul 18, 5:23 PM CDT	Tornado Warning	MPX	Ramsey, Washington	27 min
Jul 18, 5:48 PM CDT	Tornado Warning	MPX	Anoka, Ramsey, Washington	32 min
Jul 18, 5:48 PM CDT	Tornado Warning	MPX	Hennepin	32 min
Jul 18, 6:25 PM CDT	Severe Thunderstorm Warning	MPX	Chisago	55 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1986 Every severe thunderstorm warning in 1986

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.